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Mine is wired hot to a toggle switch. I turn it on when I need it, leave it off when I don't. I can also run it without the car being on at the track to cool it between runs.



This is how mine is set up now....I'd like to use a switch that closes at around 190 and opens around 170. I can use this to trigger the relay and operate the fan....problem is, all of these are sold in kits that have a lot of stuff I don't need....